Question

我有一些错误处理代码，试图确保在一定水平上捕获并处理任何问题，因此我使用了set_error_handler将可恢复的错误转换为异常，然后捕获所有异常。想法是代码是遇到一些可恢复的错误，还是引发异常，这应该捕获所有错误。但是，我看到的是正在发生可重试的错误，该错误被转换为异常，然后没有被我的捕获捕获。不明白为什么。

public function catchableFatalErrorCatcher($errno, $errstr) : bool
{
    if (error_reporting() !== 0 && $errno === E_RECOVERABLE_ERROR)
    {
        throw new ParseException($errstr, $errno); //extends \Exception
    }
    return false;
}

public function evaluate($cmd)
{
    $prevErrorHandler = set_error_handler([$this, 'catchableFatalErrorCatcher']);
    try
    {
        $tokens = $this->tokenize($cmd);
        $value  = $this->parse($tokens, $this->model);

        if (is_array($value))
        {
            // IN THE FAILURE CASE, $value IS AN ARRAY OF OBJECTS AND THIS 
            // CAUSES AN ERROR BECAUSE THE ELEMENTS CAN'T BE TURNED INTO STRINGS.
            $value = implode(', ', $value);
        }
        return strval($value);
    }
    catch (ParseException $e)
    {
        if ($this->trace !== null)
        {
            $this->trace .= $e->getMessage() . "\n";
        }
        return '';
    }
    finally
    {
        set_error_handler($prevErrorHandler);
    }
}

我最终在我的网站上遇到HTTP错误500，并在我的php错误中记录了消息：PHP Warning: Uncaught <<redacted>>\ParseException: Object of class <<redacted>> could not be converted to string。堆栈跟踪清楚地表明，由于上面提到的内爆调用，正在调用错误处理程序。怎么不被抓住！？

Answer 1

## Please Use Below code
public function catchableFatalErrorCatcher($errno, $errstr) : bool
{
    if (error_reporting() !== 0 && $errno === E_RECOVERABLE_ERROR)
    {
        throw new Exception($errstr, $errno);
    }
    return false;
}

public function evaluate($cmd)
{
    $prevErrorHandler = set_error_handler([$this, 'catchableFatalErrorCatcher']);
    try
    {
        $tokens = $this->tokenize($cmd);
        $value  = $this->parse($tokens, $this->model);

        if (is_array($value))
        {
            // IN THE FAILURE CASE, $value IS AN ARRAY OF OBJECTS AND THIS 
            // CAUSES AN ERROR BECAUSE THE ELEMENTS CAN'T BE TURNED INTO STRINGS.
            $value = implode(', ', $value);
        }
        return strval($value);
    }
    catch (Exception  $e)
    {
        if ($this->trace !== null)
        {
            $this->trace .= $e->getMessage() . "\n";
        }
        return '';
    }
    finally
    {
        set_error_handler($prevErrorHandler);
    }
}

PHP错误处理程序引发未捕获的异常

1 个答案: